definition of
weaken

[1] #1 weaken v. lessen the strength of; "The fever weakened his body". wn

[2] #2 weaken v. become weaker; "The prisoner's resistance weakened after seven days". wn

[3] #3 weaken v. [sabotage, undermine, countermine, counteract, subvert] destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war". wn

[4] #4 weaken v. [de-escalate, step down] reduce the level or intensity or size or scope of; "de-escalate a crisis". wn

[5] #5 weaken v. [dampen, damp, soften, break] lessen in force or effect; "soften a shock"; "break a fall". wn